Among the following options, which contains the least trans fat?

Potato chips generally contain the least trans fat compared to the other options listed. The rationale behind this is primarily based on the production methods and fat content of the various foods listed.

Trans fats are often created during the process of hydrogenation, which is used to solidify liquid oils. Margarine, particularly the stick varieties, often contain higher levels of trans fat due to this process, as they are designed to mimic the texture and stability of butter. Grain-based processed foods can also include trans fats, especially if they contain hydrogenated oils for preservation and texture. French fries are commonly fried in oils that may contain trans fats or, if prepared in certain types of fast food environments, can be cooked in oils that have been hydrogenated to prolong shelf life and improve crispness.

Potato chips, while they can have some trans fats depending on the type of oil used for frying, often utilize non-hydrogenated oils or are frequently labeled as having 0 grams of trans fat in many brands due to changes in food labeling practices and consumer demand for healthier products. This trend has led manufacturers to reduce or eliminate trans fats from their formulations.

Thus, potato chips, in many cases, may contain the least trans fat among the options given,